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FLOW CHARACTERISTICS OF INCLINED ELLIPTIC NOZZLES

T. H. New
Department of Engineering University of Liverpool Brownlow Hill, Liverpool L69 3GH, United Kingdom

D. Tsovolos
Department of Engineering University of Liverpool Brownlow Hill, Liverpool L69 3GH, United Kingdom

要約

A flow visualization and digital particle image velocimetry study has been carried out to investigate the resultant flow behaviour of elliptic nozzles with 30° and 60° inclined exits along the major- and minor-planes. Flow images show that regardless of incline-plane, persistently inclined vortex roll-ups are produced for 30° incline case, whereas they undergo rapid turning for the 60° incline case. Axis-switching behaviour is either distorted or suppressed in all inclined nozzles tested. Systematic differences in the vorticity distributions and magnitudes suggest that imposing inclined exits leads to dissimilar vortex-stretching, the extent of which depends on the exact nozzle configuration. Lastly, Reynolds flow stress results indicate that the resultant mixing haracteristics are strongly affected by the inclined nozzle designs.